Sunken bathtub



FIG. 1 is a top front-end perspective view of a sunken bathtub showing my new design;

FIG. 2 is a top plan view thereof on a reduced scale;

FIG. 3 is a left side elevational view thereof on a reduced scale;

FIG. 4 is a right hand side elevational view thereof on a reduced scale;

FIG. 5 is a bottom plan view thereon on a reduced scale;

FIG. 6 is a front elevational view thereof on a reduced scale;

FIG. 7 is a rear elevational view thereon on a reduced scale.

The floor is shown in broken lines in FIG. 1 for illustrative purposes only. 

The ornamental design for a sunken bathtub, as shown and described. 